By mapping the magnetic fields for each structure, the scientists observed the Giant Proximity Effect and found that a thick barrier of superconductor with a Tc of 5 Kelvin could transmit supercurrent at a temperature four times higher, if it is sandwiched between two superconductors with a Tc of 40 Kelvin. Their results also proved that the entire barrier layer is affected by the Giant Proximity Effect.
Wednesday, April 13, 2011
'Giant Proximity Effect' enhances high-temperature superconductivity: o explore the Giant Proximity Effect, Bozovic and his team engineered complex cuprates using a process called molecular beam epitaxy. They synthesized samples of thin films containing layers of lanthanum-cuprate superconductors doped with strontium to various levels, to create a series with varying transition temperatures. The Brookhaven samples were studied at PSI using a unique technique called low-energy muon spin rotation to detect superconductivity in each sample’s outer and inner layers.